Scattering amplitudes from unitarity-based reduction algorithm at the integrand-level

Authors

P. Mastrolia, Universita di Salerno
Giovanni Ossola, CUNY New York City College of TechnologyFollow
T. Reiter, Nikhef
F. Tramontano, Nikhef

Document Type

Article

Publication Date

8-16-2010

Abstract

Samurai is a tool for the automated numerical evaluation of one-loop corrections to any scattering amplitudes within the dimensional-regularization scheme. It is based on the decomposition of the integrand according to the OPP-approach, extended to accommodate an implementation of the generalized d-dimensional unitarity-cuts technique, and uses a polynomial interpolation exploiting the Discrete Fourier Transform. samurai can process integrands written either as numerator of Feynman diagrams or as product of tree-level amplitudes. We discuss some applications, among which the 6- and 8-photon scattering in QED, and the 6-quark scattering in QCD. samurai has been implemented as a Fortran90 library, publicly available, and it could be a useful module for the systematic evaluation of the virtual corrections oriented towards automating next-to-leading order calculations relevant for the LHC phenomenology.

Comments

This article was originally published in the Journal of High Energy Physics, available at doi:10.1007/JHEP08(2010)080.

This article is distributed under the terms of the Creative Commons Attribution Noncommercial License.